Adjustable twin saw



Patented Aug. 22, 1922.

C. RUDlCH.

ADJUSTABLE TWIN SAW.-

APPLICATION FILED FEB. 25, ms.

RENEWED JAN. 6,1922.

ounce srArrsraraur OFFICE.

CHARLE S RUDICI-I, OF NEW N. 2K1, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE KNY-SCHEERER CORPORATION (in TION OF NEW YORK.

AME-RICA, UF- NEW YORK, N. Y., A CORPORA- ADJUSTABLE TVJIN SAXV.

Patented Aug 22, 1922.

Application filed February 25, 1918, Serial No. 219,011. Renewed January 6, 1922. Serial No. 527,517.

T all whom it may concern Be it known that I, Jr-mums Rumour, a subject-oi" the Emperor of Austria and a resident of New York city, county and State of New York, have invented. certain new and useful Improvements in .z'idjustable Twin fjaws, set forth in the following specification.

This invention relates to tools employed in bone surgery The object of the invention is to improve the means for adjusting and operativelv mounting' a surgical saw, and more particularly the relative mounting and adjusting of twin saws.

An illustrative embodiment of the invention is described in the following specification in connection with the accompanvmg drawings, which form apart hereof in which like characters desigmate correspondin; parts in the several figures, and. in wh1ch Figure 1 is a side elevation of the complete tool;

Figure 2 is a fragmentary scct1on along line II--II of Figure 1;

Figure 3 is a section through line IIITII of Figure 2; and

Figure 1 is a section through line IV-IV of Figure 2.

A rotarv chuck shank having any suitable formation such as l and 2 to cooperate with a tool chuck, is preferahl provided with threads 3 for a purpose presentl v to be described. These threads mav he readily cut directlv into the stock from which the shank A. is being fabricated although their purpose is to orm a tooth portion, for anchoring the saw carriage B. The free end 4-, of the shank A has threads 5 to cooperate with the nut 6 for operativelv mounting the saw 7 against the holder 8. The holder 8 is shown seated in a rabhet formed at the end of the guide sleeve C. which embraces the threaded portion 3 of the shank A and which should he anchored thereto in anv suitable manner, as hv a pin 9. The (wide sleeve C is formed with a longitudinal channo]. 10 and preferahlv with a flange 11. The carriae'e B provides an adiustahle mounting for the second saw and is formed of an inner sleeve 13 fitting slidahlv upon a guide sleeve 0 and. having a threaded end 14 to cooperate with the nut 15 for ooerativelv mountinrr the saw 12. Back of the saw 1.2

is an outer ring 16 anchored in anv suitablemanner to the inner sleeve 13. Over the opposite end of the inner sleeve 13 is a second ring; 17, anchored in any suitable manner to the inner sleeve 13, as by a screw 18; The inner sleeve 13 has a perforation 19 to permit the entrance of the block 20, which is prefc-rahlv fixed to a movable ring 21, which surrounc s the inner sleeve 13, between the two rings 16 and 17. This ring 21 is normally forced into an eccentric position by a spring 22 held in position by the pin, 23, so that the block 20 is normally forced through the longitudinal channel 10 against what in effect are teeth provided by the threads The inner face of the block 20 likewise is formed with teeth 25 to cooperate with the threads On the side opposite the spring 22 the inner sleeve 13 has bevelled portions 26 to accommodate the eccentric position for the ring 21. The block 25 prevents relative rotation between the carriage and the guide sleeve C, and. when its teeth are engaged with the threads 3 no longitudinal or axial movement of the carriage B can take place. Finger pressure upon the ring 21 in a direction against the force of the sprino 22 releases the block 20 from the teeth 3 and permits the carriage B to be adjusted axially to the desired position, in which it is locked when pressure is removed from the ring 21.

What I claim and what T desire to secure by United States Letters Patent is 1 An adjustable multiple saw-tool comprising; a rotarv chuekshank; a guide-sleeve fired to said shank and having a longitudinal. locking channel; a carriage for mounting a, circular saw slidahle on said sleeve; teeth ormed crosswise at the base of said. channel: and a releasable spring-pressed toothed block passing through said channel locking said carriage against relative rotation and permitting the axial adjusting and fix-inc of said carriage.

In combination in a tool-holder, a threaded shank: a sleeve fitted over said hreaded shank and having a longitudinal channel civing access to portions of the threads of said threaded shank; a carriage riding on said sleeve; and a radiallv movahle toothed member anchoredv to said carriaee and passing through said channel to interlock with the threads of said shank.

2. An adiustahle surgical twin-saw comprising a sincrle shank-member mounting two spaced circular saws, the mounting of one saw comprising a carriage having interior axially extensive guide-surfaces and a radially movable axial locking means; said shanlmnember having an axially continuous guide-Way for said carriage and a separated gripping means to cooperate with the said locking means of said carriage to fix said earriage in any one of various axial positions.

4. An adjustable, multiple saw tool comprising a rotary chuck-shank; a saw mountingat one end of'said shank; screw-threads provided. on said shank back of said mounting; avguide-sleeve having an axial or longi tudinal slot mounted on said shank back of said mounting; a carriage having a saw mounting slidably engagin said guidesleeve; and a finger releasable means penetrating said slot to prevent relative rota tion between said carriage and said spindle and operative to engage said threaded portion to prevent axial. motion.

In testimony whereof I have signed my name to this specification, this 18th day of February, 1918.

CHARLES RUDICHi 

